How to search for peaks in a signal?

I made some measurements of vibration and I have applied the FFT to view the signal spectrum, I want to make a "peak search" so that putting a condition, the program throws me values ??greater than the setpoint. For example my frequency range from 0 Hz to 1 kHz and amplitude of the spectrum ranges from 0 to 5 mm / s, I want to know how many peaks are between 1.12 mm / s and 2.3 mm / s, and at what frequencies correspond these values???

Answer 1

[Jiro Doke]

Try using findpeaks from the Signal Processing Toolbox. You can specify minimum peak height, and after getting the results, you can throw away the peaks that exceed your upper bound.